power ratio between hydraulic central pto

[Patrick Gorza]

Good morning forum!
return to you experts with a "hypothetical problem" that was raised to me when I asked for technical assistance to an oleodynamic shop where I want to order components.
without stretching out what materials are already in possession or not, I will list the material required for the construction of a high amount of oil flow hydraulic power plant, which will act (besides the rest) a large spool.
- Serbian capacity about 300 litres.
- multiplier gr. 3 1:3,8
- pump oleod. 55cc/turn
- radiator about 120 lt/min
- distributor oleod. 120 lt/min
- oleod cylinder with 150 mm shirt; 90 mm stem; stroke 1400 mm for a push of about 35 ton.
It follows that maintaining the tractor to a pto regime of 600 rpm I will have a flow rate of 600x3,8x55=125 lt/min with a thrust of 35 ton.
someone will wonder what the sense of such a high flow of oil is. I want to avoid falling asleep between one cycle and the other of the piston.
asking the shopkeeper whether his products (among other things sold at a reasonable market price) were up to or not to endure this type of work (heavy-duty), I was objected that my 66 cv tractor, maintained at a 600 rpm regimen, is probably not able to hold the power required by the pto.
What do you think?
Thank you.
Patrick.

 

[meccanicamg]

let the power of the system that are selling you, so we cut the head to the bull.
certainly you are not working very well because you are going to more than 100mm/s especially back.
it would be worth using a motor and a variable cylinder that can optimize the cycle. high force when cutting but if I cut butter will not go to 200bar but takes what you need it eva more in speed.

the multiplier is one gear mounted between pto and pump hope.

with an 80% yield it takes 46kw.... do you have it? in theory 66cv are 48kw hoping to have them to 600rpm pto exit.
You miss a few tons.

 

[Patrick Gorza]

Hello mechanicalmg.
I attach the link of a sprinkler of the growi (gsw 30 3 d 3p turbo) with 120 l/min pump, 31 tons of spacing and an incredible speed (as you can see in the video).
the house has equipped it with 2 options:
- electric motor from 11 kw (of course slower)
- cardan with required power from 25 cvyou will notice that under effort the speed decreases slightly, but not excessively, being a double pump.

GROWI – GSW 30 D 3P Dreipunkt Turbo Waagrechtspalter – Growi Maschinenbau Oberthingau

growi-maschinenbau.de

to you the conclusions.. .

 

[Patrick Gorza]

let the power of the system that are selling you, so we cut the head to the bull.
certainly you are not working very well because you are going to more than 100mm/s especially back.
View attachment 69955it would be worth using a motor and a variable cylinder that can optimize the cycle. high force when cutting but if I cut butter will not go to 200bar but takes what you need it eva more in speed.

the multiplier is one gear mounted between pto and pump hope.

with an 80% yield it takes 46kw.... do you have it? in theory 66cv are 48kw hoping to have them to 600rpm pto exit.
View attachment 69956You miss a few tons.

beautiful this spreadsheet. Where do I find him? I've got another one. I'll train you. . .

 

[meccanicamg]

Hello mechanicalmg.
I attach the link of a sprinkler of the growi (gsw 30 3 d 3p turbo) with 120 l/min pump, 31 tons of spacing and an incredible speed (as you can see in the video).
the house has equipped it with 2 options:
- electric motor from 11 kw (of course slower)
- cardan with required power from 25 cvyou will notice that under effort the speed decreases slightly, but not excessively, being a double pump.

GROWI – GSW 30 D 3P Dreipunkt Turbo Waagrechtspalter – Growi Maschinenbau Oberthingau

growi-maschinenbau.de

to you the conclusions.. .

in the first cut will have butter and you can not see. in the second cut instead you see that it comes fast, it makes strength slowing, now the fatigue does not do it anymore and continues faster.
therefore the hydraulic pump is able to adapt to the load.

if you mount a piston pump with adjustment to constant power You get that effect you saw.

 

[meccanicamg]

beautiful this spreadsheet. Where do I find him? I've got another one. I'll train you. . .

are part of my excel sheets that I have done in the years of work and study and in the end are applied two formulas.
yours instead has the tabs where you fish the charted values, so more aimed at having practical feedback. mine is more free and you have to search for data, simply for a iso cylinder and insert it.

 

[Patrick Gorza]

in the first cut will have butter and you can not see. in the second cut instead you see that it comes fast, it makes strength slowing, now the fatigue does not do it anymore and continues faster.
therefore the hydraulic pump is able to adapt to the load.

if you mount a piston pump with adjustment to constant power You get that effect you saw.

...whether a piston pump costs "lightly more".